Thixotropic agent for curable compositions

A thixotropic agent and composition technology, applied in the fields of sealants or coatings, elastic adhesives, can solve problems such as unfavorable processability and viscosity increase, and achieve the effects of easy processing, high thixotropy and good flexibility

Active Publication Date: 2021-06-11
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polyols react with isocyanate-group-containing compositions, they do not cause a migration effect, but lead to a sharp increase in viscosity, which is detrimental to good processability and the resulting thickened product when the application tool is removed. drawing

Method used

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  • Thixotropic agent for curable compositions
  • Thixotropic agent for curable compositions
  • Thixotropic agent for curable compositions

Examples

Experimental program
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preparation example Construction

[0045] The preparation of the urea compounds is preferably carried out in a continuous process, in which the amines and / or isocyanates are used optionally diluted with polyethers having blocked hydroxyl groups.

[0046] The preparation is preferably carried out with the exclusion of moisture. Preferably no further additives are present during the preparation, in particular no solvent and no catalyst.

[0047] Preferably, the thixotropic agent is present in the form of a spreadable paste that resists sagging at room temperature.

[0048] The thixotropic agent preferably comprises 5 to 25% by weight of urea compounds and 50 to 95% by weight of polyethers with blocked hydroxyl groups. The thixotropic agent particularly preferably comprises 10 to 25% by weight of urea compounds and 75 to 90% by weight of polyethers with blocked hydroxyl groups.

[0049] Polyethers with blocked hydroxyl groups are substantially free of unblocked hydroxyl groups. "Essentially free" here means tha...

Embodiment

[0246] Examples are described below, which explain the present invention in more detail. The invention is of course not limited to the described embodiments.

[0247] "Normal climate" ("NK") means a temperature of 23±1° C. and a relative air humidity of 50±5%.

[0248] Chemicals used were from Sigma-Aldrich Chemie GmbH if not stated otherwise.

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Abstract

The invention relates to a thixotropic agent for increasing the yield point of a curable composition, wherein the thixotropic agent comprises (i) at least one urea compound from the reaction of at least one isocyanate with at least one amine and (ii) at least one polyether having blocked hydroxyl groups. The thixotropic agent is easy to produce and forms a spreadable paste which is stable at room temperature. The thixotropic agent is particularly suitable as a component of moisture-cure polyurethane- or SMP compositions, in which said agent effectively increases the yield point of said compositions without adversely affecting the storage stability or migration behaviour. Said agent provides phthalate-free adhesives, sealants and coatings which can be conveyed surprisingly well at a high yield point and do not cause problems with odour or fogging.

Description

technical field [0001] This invention relates to thixotropic agents and curable compositions thickened therewith, especially elastic adhesives, sealants or coatings. Background technique [0002] In curable compositions based on polyurethane polymers or silane-modified polymers (SMP), so-called thixotropes are often used in order to increase their yield point and thus their sag resistance (Standfestigkeit) and thus improve the processability of the product sex. Especially for paste adhesives and sealants, it is important that the sag resistance is high, the extrusion force not to be too high and the stringing when removing the applicator tool short. Particularly effective and inexpensive thixotropes are fine dispersions of urea compounds, especially the reaction products of diisocyanates with low molecular weight primary amines, which are prepared in a liquid carrier material and are homogeneous, spreadable pastes. The content of urea compounds is usually only about twenty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/75C08G18/76C08G18/12C08G18/16C08G18/24C08G18/28C08G18/32
CPCC08G18/12C08G18/161C08G18/168C08G18/246C08G18/2865C08G18/3256C08G18/4825C08G18/4829C08G18/755C08G18/7671C07C273/1818C08K5/06C08K5/21C09K3/10C09K2003/1071
Inventor A·克拉默U·布尔克哈特M·施伦普夫M·康斯坦泽尔
Owner SIKA TECH AG
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